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The Config Builder creates fully configured instances of config classes, using values from various sources like properties files, command line arguments etc.

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package com.tngtech.configbuilder.util;


import com.google.common.collect.Lists;

import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.List;
import java.util.Set;

import static org.reflections.ReflectionUtils.*;

public class AnnotationHelper {

    public List getAnnotationsAnnotatedWith(Annotation[] annotations, Class annotationClass) {
        List result = Lists.newArrayList();
        for (Annotation annotation : annotations) {
            if (annotation.annotationType().isAnnotationPresent(annotationClass)) {
                result.add(annotation);
            }
        }
        return result;
    }

    public List getAnnotationsInOrder(Field field, Class[] annotationOrder) {
        List result = Lists.newArrayList();
        for (Class annotationClass : annotationOrder) {
            if (field.isAnnotationPresent(annotationClass)) {
                result.add(field.getAnnotation(annotationClass));
            }
        }
        return result;
    }

    public Set getFieldsAnnotatedWith(Class clazz, Class annotationClass) {
        return getAllFields(clazz, withAnnotation(annotationClass));
    }

    public Set getMethodsAnnotatedWith(Class clazz, Class annotationClass) {
        return getAllMethods(clazz, withAnnotation(annotationClass));
    }

    public boolean fieldHasAnnotationAnnotatedWith(Field field, Class annotationClass) {
        Annotation[] annotations = field.getDeclaredAnnotations();
        return !getAnnotationsAnnotatedWith(annotations, annotationClass).isEmpty();
    }
}